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Reproductive System

This article explores the reproductive system and its hormones, including testosterone and estrogen. It discusses the male and female reproductive systems, the menstrual cycle, fertilization, fetal development, and childbirth.

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Reproductive System

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  1. Reproductive System

  2. Sex & Growth Hormones • Large scale body changes • how do they work • turn genes on • start new processes in the body by turning genes on that were lying “dormant”

  3. Reproductive hormones • Testosterone • from testes • sperm production & secondary sexual characteristics • Estrogen • from ovaries • egg production, preparing uterus for fertilized egg & secondary sexual characteristics

  4. Male reproductive system • Sperm production • over 100 million produced per day! • ~2.5 million released per drop!

  5. seminiferoustubule sperm spermatocytes

  6. Male reproductive system • Testes & epididymis • sperm production & maturation • Glands • seminal vesicles, prostate, bulbourethal • produce seminal fluid • nutrient-rich

  7. Male reproductive system • Testicles • produces sperm & hormones • Scrotum • sac that holds testicles outside of body • Epididymis • where sperm mature • Vas deferens • tubes for sperm to travel from testes to penis • Prostate, seminal vesicles, Cowper’s (bulbourethal) glands • nutrient rich fluid to feed & protect sperm

  8. Female reproductive system

  9. Female reproductive system • Ovaries • produces eggs & hormones • Uterus • nurtures fetus; lining builds up each month • Fallopian tubes • tubes for eggs to travel from ovaries to uterus • Cervix • opening to uterus, dilates 10 cm for birthing baby • Vagina • birth canal for birthing baby

  10. Egg maturation in ovary releasesprogesterone maintainsuteruslining produces estrogen

  11. LH Menstrual cycle • Controlled by interaction of 4 hormones • FSH & LH • estrogen • progesterone FSH ovulation = egg release egg development corpus luteum estrogen progesterone lining of uterus days 0 7 14 21 28

  12. corpusluteum ovary yes corpusluteum no Feedback Female reproductive cycle eggmatures & is released(ovulation) builds up uterus lining estrogen progesterone FSH & LH fertilized egg(zygote) maintainsuterus lining HCG pituitarygland pregnancy progesterone GnRH corpus luteum breaks down progesterone drops menstruation maintainsuterus lining hypothalamus

  13. Female hormones • FSH & LH • released from pituitary • stimulates egg development & hormone release • peak release = release of egg (ovulation) • Estrogen • released from ovary cells around developing egg • stimulates growth of lining of uterus • decreasing levels causes menstruation • Progesterone • released from “corpus luteum” in ovaries • cells that used to take care of developing egg • stimulates blood supply to lining of uterus • decreasing levels causes menstruation

  14. Fertilization

  15. Placenta • Food & gases diffuse across blood vessels

  16. Human fetal development 4 weeks 7 weeks

  17. Human fetal development 10 weeks

  18. Human fetal development 12 weeks 20 weeks

  19. Human fetal development • The fetus just spends much of the 2nd & 3rd trimesters just growing …and doing various flip-turns & kicks inside amniotic fluid Week 20

  20. Human fetal development • 24 weeks (6 months; 2nd trimester) fetus is covered with fine, downy hair called lanugo. Its skin is protected by a waxy material called vernix

  21. Human fetal development • 30 weeks (7.5 months) umbilical cord

  22. Getting crowded in there!! • 32 weeks (8 months) The fetus sleeps 90-95% of the day & sometimes experiences REM sleep, an indication of dreaming

  23. positive feedback Birth

  24. The end of the journey! And you think Mrs. Stevenson’s class is hard!

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